Name: Xenoposeidon ‭(‬strange Poseidon‭)‬.
Phonetic: Zee-noe-po-sy-den.
Named By: Mike P.‭ ‬Taylor‭ & ‬Darren Naish‭ ‬-‭ ‬2007.
Classification: Chordata,‭ ‬Reptilia,‭ ‬Dinosauria,‭ ‬Saurischia,‭ ‬Sauropoda.‭
Species: X.‭ ‬proneneukos‭ (‬type‭)‬.
Diet: Herbivore.
Size: Highly uncertain given the lack of fossil remains,‭ ‬but estimates exist depending upon what type of sauropod Xenoposeidon was.‭ ‬About‭ ‬15‭ ‬meters long if built like a brachiosaurid,‭ ‬alternatively‭ ‬20‭ ‬meters long if built like a diplodocid.
Known locations: England,‭ ‬East Sussex‭ ‬-‭ ‬Hastings Bed Formation,‭ ‬Ashdown Beds Formation‭?
Time period: Berriasian of the Cretaceous.
Fossil representation: Partial posterior portion of a dorsal‭ (‬back‭) ‬vertebra.

       Way back during the‭ ‬1890s,‭ ‬a fossil collector named‭ ‬Phillip James Rufford discovered a partial dorsal vertebrae near Hastings in East Sussex,‭ ‬England.‭ ‬Eventually catalogued as BMNH R2095,‭ ‬the vertebrae was first thought to belong the genus Cetiosaurus by Richard Lydekker,‭ ‬before eventually becoming Pelorosaurus conybeari.‭ ‬That was about it for well over a hundred years as the specimen lay in storage at the British Natural History Museum in London,‭ ‬England,‭ ‬until one day a palaeontologist named Mike Taylor realised that this partial vertebrae was quite unusual.‭ ‬Mike Taylor teamed up with another palaeontologist named Darren Naish,‭ ‬and in‭ ‬2007‭ ‬a description of this vertebra was not only published,‭ ‬but the vertebrae became the holotype for a new genus of sauropod dinosaur:‭ ‬Xenoposeidon.
       The vertebrae though incomplete,‭ ‬displays a number of features that have simply not been seen upon any other sauropod dinosaur,‭ ‬which actually would make further remains attributable to Xenoposeidon as long as vertebrae were with them for comparison.‭ ‬The unfortunate thing about the vertebrae however is that although we know it belonged to a sauropod dinosaur,‭ ‬we don’t specifically know what kind.‭ ‬Fortunately in their‭ ‬2007‭ ‬description Taylor and Naish considered that Xenoposeidon may have been built either like brachiosaurids‭ (‬similar to Brachiosaurus‭) ‬or diplodocids‭ (‬similar to Diplodocus‭)‬.‭ ‬If brachiosaurid,‭ ‬then the length may have been about fifteen meters,‭ ‬but heavily built,‭ ‬while if diplodocid about twenty meters but lightly built.‭ ‬Unfortunately it seems that the only we anyone can be more certain about this is if more fossils can be found.

Further reading
-‭ ‬An unusual new neosauropod dinosaur from the Lower Cretaceous Hastings Beds Group of East Sussex,‭ ‬England.‭ ‬-‭ ‬Palaeontology‭ ‬50‭(‬6‭)‬:1547-1564.‭ ‬-‭ ‬Mike P.‭ ‬Taylor‭ & ‬Darren Naish‭ ‬-‭ ‬2007.


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